Means for draining oil well tubing



Oct. 18, 1938. C, 1 CQBERLY 2,133,272

MEANS FOR DRAINING OIL WELL TUBING Filed Feb. 1l, 1935 2 Sheets-Sheet l Fig. 2.

Oct. 18, 1938. :l J, CQBERLY 2,133,272

MEANS FOR DRAINING OIL WELL TUBING ffveryroef @Lees/ves x/ Coex .4r-Toe des.

Patented Oct. 18, 1938 Clarence J. 'Coberln Los Angeles. Galli.. asdgnm' to Beko Corporation, mi, Nev., a

oi.' Nevada lit .l

VApplication February 11, 1935, Serial No. Y5,9218

`This invention is in part a division of my copending application Serial No. 740,452, led August 18, 1934, and entitled Method and apparatus for installing' deep well pumps, which issued on October '6, 1936, as Patent No. 2,056,418, and relates-in particular to a simple means lor preventing loss of oil from the production tubing of aweil pumping device, together-with Vmeans for draining the oil trom the tubing when it is desired to pull the same from the well.

Although the' invention maybe used with 4vurious types of pumping equipment, it is particularly adapted for use with the oil production tubing of a iiuid operated deep well pump. In such a pumping device the pump proper is lowered into the production tube to a point near the bottom thereof and operates to pump oil from f the weil upwardlythrough the production tube to suitable discharge piping at the top of the ,well. It becomes necessary at times-to remove lthe pump from the well for the pinposeo! in lowered into the production spection or repair. and it is desirable to do this without the loss of the ou which is n; the

ing back into the well whenthe pump is raised Iromits seat atthe lowerend ot the production. "tube This-loss of oil is prevented by the plac-x My invention has for its principal' objectft'o provide a means' for opening the inlet check.

valve of the production tubing so that the oil therein will drai'back into the well, should it become for any reason to pull the production tubing.` thereby avoiding what is known as o. iwetfpulling job.

V It is a further 'oblect i the invention to provide aproduc'tlon tube with n check valve structure at the lower eiiclY thereohand a member adapted tobe lowered through the production tube for engaging the check valve structure so Aai: to open thev'alve ot the check valvestructure,'th isi'nember being'eo constructed as to produce s pressure differential' above and below the saine. so as to hold the check valve in rei lation against hydraulic forces tending to close it is on obieot of production tubingvv with an inlet check valve at the lower end thereof. and means adapted to be the invention to .provide aproductiontube. as the `i'eiiult of the same drain-l y Under ordinary conditions operation the (cl- 10H8) tubingiromtheupper end thereof. which. upon .reaching the bottom ofthe wellwlllopentheinietcheckval've sothattheoilcontentmaydrainfromthesame.

It is a further-object of the invenion to pro-15 vide a valve openlngmeans of the above character having 'an prince therein through which the escaping oil mustpasa on its ow through the production tubing to the check valve. thereby producing a pressure differential above and below the device to a `force uiiicient to hold the inlet check valve open againstthe hydraulic pressure tending to close the same.

`It is a further object of the invention to provideavalve i'orthelowerendoi'anoiltubein a well, comprising a body havinga chamber connectedthroughaverticalwiththeinterlor of the tubing and having a lateral e '.extendinglaterallythroughtheside thereofto theexrterioroithebodxwlthaninwardlyiaced -valve-seatinthlslateralopenlngandaelosure membeiprei'erably of ,it-steel hail adapted to be moved by hydraulic' pressure into engagement with thevalve seat, `In conilmciion. with the i'.- it is an object toprovlde a means odaiptedtobelcrwereiiilownthroiughthev tubing into ent wlthjthe ao'as to move. auchv closure Oineml'ier trom eri--A sagement with the neat.

Itis a furthei object ot the'invention to provide a device of the which will operate satisfactorily even though a material amountofsedimentmaycollectlnthelowerend Further'objects and o! the invention will `be made vident'throughwt the followin! part of the speciilcatlon.

Referring to the drawings. which are for illusimalternativetoi-niorlvnlviiopeningmneans.'

6 is a sectlonedview form inventionadaptedforuseinthe l which mim intheoil vdorivnti'om'tlie Fig. 6 is a cross section on a plane represented by the line 6-6 of Fig. 5.

In Fig. 1 I show an oil production tube I0 which may be extended down through the piping Il of a well to the oil producing `zone of the well. The oil production tube may be hung in the well by the use of a head I2 having an oil discharge pipe I3 leading therefrom for carrying the oil to a suitable means for disposal. In the Alower end of the tube I0 is a valve body |4 which is secured in place preferably by threaded engagement at |6 with the lower end of the tube I0. This valve body constitutes the casing of 4a valve structure and has a chamber I6 formed therein which communicates through a vertical opening I1 with the interior of the production tube. and which communicates with the exterior of the body I4 through a lateral opening IB through which oil may pass inwardly from the weil. In the lateral opening I8, which tapers outwardly, an inwardly facing valve seat I3 is secured. The diameter of this valve seat is slightly less than the diameter of the vertical opening |1 so that it may be passed through the vertical opening I1 into engagement with the tapered walls of the lateral opening I3 in which it seats in fluidtight engagement. In the chamber I6 is a closure member, preferably in the form of a ball 2|, adapted to move laterally into a position of engagement with the seat I3 whereby to close the opening 22 through the same. Hydraulic pressure exerted on the interior of the tube ||l due to a static head of oil therein will be transmitted to the chamber I6 and will cause the movement of the valve ball 2| into engagement with the seat I9.

In the ordinary operation of the pumping device shown in Fig. 1, a deep well pump 23 rests in a tapered seat 24 formed at the upper end oi the valve body I4 so that the inlet opening 25 of such pump 23 connects directly to the upper end of the vertical opening I1 of the valve body. Accordingly, during the operation of the pump, oil is drawn by the pump through the opening 22 and the vertical passage I1, and such oil is discharged by the pump into the space existing around the same in the production tube Il) wherein it travels to the surface of the ground and is discharged through the piping |3 to a suitable oil receiver 26, the characteristics o! whichv form no part of the present invention but which are shown in my copending Patent No. 2,046,770, issued July "I, 1936. The pump 23. when it becomes worn or inefficient from any other cause, is pulled from the production tube III. As soon as the pump 23 rises from the seat 24, the full pressure of the oil within the production tube I0 is exerted in the valve chamber IB and causes the closing of the Ivalve structure represented by the ball 2| and the seat I9. Ordinarily, the production tube remains in the well for a long period of time. but when it becomes necessary 'to remove the production tube from the well. it is desirable to drain the oil therefrom so that such oil will not be spilled uponthe derrick door, as occurs when oil well tubing lled with oil is pulled from a well.

My invention provides a means for moving the ball or closure member 2| into o pen relation to the seat I9 when it is desired to d rain the production tube III. Such means comprises a member 30 such as shown in Fig. 2 adaptedto be moved downwardly through the production tube to the lower end thereof, this member 30 having a downwardly extending part or stem 2| of such size that it will pass through the vertical opening I1 to strike the ball 2| and displace the same downwardly from the position indicated by dotted lines 32 in Fig. 2 to the position in which it is shown in full lines. In this preferred form of the invention the stem 3| has a head 34 at the upper end thereof formed with an upwardly faced shoulder 35 and a threaded pin 36 adapted to enter a threaded opening 31 of a body 3B which for-ms the upper part of the member 3|) and is of sumcient weight to cause the member 30 to pass downwardly through the body of oil in the production tube III at desired velocity.

So that the stem 3| of the member 3|) will positively hold the ball 2| in open relation against the hydraulic forces tending to move the same into closed position relative to the seat 22, I provide hydraulic means in connection with the member 30 for producing a downwardly acting pressure diiierential above and below the same. This hydraulic means consists of a cup washer or sealing member 40 which is held against a dished ring 4I carried by the shoulder 35 of the head 34, and the hydraulic means further consists of metering fluid passages 42 in the member 30 which I connect through passages 43 and 44 with the space above the cup washer 4D. It will be noted that the metering orices 42 are formed diagonally in the lower part of the head 34 and that they are of such restricted size that the ow of Iiuid therethrough will be less than the flow capacity of the opening 22 when the bail 2|. is held in open relation to the seat I3. as shown in Fig. 2. The pressure differential thus produced results in a lower pressure in the space 45 below the cup washer 4|). the result being that the lmember 3|! is held forcibly downwardly by a superior pressure of iluid against the upper end thereof, to assure the holding of the ball 2| in open relation as shown invFig. 2. Not only is the ball 2| held downwardly with great pressure, but the forces tending to move the same laterally into engagement with the seat I3 are reduced by reason of the fact that the pressure of fluid in the space 45 and in the chamber I6 is reduced as the result of the passage of the uid through the restricted metering orifices 42. Should it be desired to remove the opening device 30 from the position in which it is shown in Fig. 2, without removing the production pipe III from the well, I provide a socket 41 in the 'upper end of the body 38 which may be engaged by use. of a suitable devicelowered into the production tube l0 for this purpose.

In Fig. 2 I have shown a form of valve actuating device in which the hydraulic pressure diierential is produced by the use oi iiow restricting orices formed in the body of the valve actuating device represented by the member 30 of Fig. 2. In Fig. 4 I show a form of my invention in which the pressure differential is produced by the use of exterior orifice means. In Figui I have shown a valve body |411 threaded into the lower end of a tube member lila. The major portion of the opening 48 through the tubing Ita is sufficiently large for the free downward passage of Va cylindrical body GII having a downwardly extending part 5| for engaging a part ofthe ch'eclc'valvf structure carried in the valve body Ila, the engaged part being shown as a bal1`2|av which i` displaced downwardly by the part 5I from a position of cooperation with an inwardly faced sea i3d, as shown in Fig. 4. I

y The interior of the tube Illa' isrestricted nea: its lower end to provide a constricted bore portion 52 of a diameter very little larger than the diameter of the lower end of the cylindrical body l. The restricted bore 52 is so placed, and the length of the downwardly extending part or stem 5| is so selected, that as the ball 2in is displaced downwardly, the lower end 53 of the member 50 will pass into the upper end oi' the restricted bore 52, the parts 52 and 53 then forming a ow restricting valve means providing a very narrow annular orifice 54 between them through which oil may pass from the space 55 above the restricted bore portion 52 to the space 56 below the restricted bore portion 52.

In the alternative form of the invention shown in Fig. 5 a valve body Ma is shown connected to the lower end of a tubing member a, The valve body Hc has a tapered seat 24a in the upper end thereof, but the lower end of the valve body Ila is provided with an axial opening 60 equipped with internal threads 5I and 62 and a radial, downwardly faced shoulder 53 above the threads 62. Into the threads 6| a chamber member or sediment receptacle BI is screwed, and in the upper portion of the receptacle 6l a guide sleeve 65 is secured. This guide sleeve 65 consists of a thin-walled tube having a threaded collar i6 secured to the upper end thereof, this collar being threaded to engage the internal threads 52. 'I'he internal diameter of the guide sleeve 85 is slightly greater than the diameter of the chamber a of the valve body Ila.

In the lower end of the guide sleeve 65 a collar 81 is secured to provide a stop for the lower end of a compression spring 6B which extends upwardly within the sleeve 65 and resillently holds a movable spider III in raised position and against the downwardly faced shoulder B3 of the valve body Ila. 'Ihis spider 10 comprises an axial portion 1I with legs or arms 12 extending radially from the ends thereof so as to have guiding engagement with the sleeve 65. Extending upwardly from the spider 1li is a post 13 adapted to support a ball 14 in a posltionto cooperate with the valve passage 15 through a valve seat 19a' Ycarried by the valve body Ila. Where the valve structure shown in Fig. 5 is employed, a pump 11, which is to be seated in the tapered valve seat 24a, is provided with a downwardly extending tubular inlet pipe 18 having a number of radial openings 19 therein. 'I'he length of this tube 18 is materially greater than the distance from the tapered seat 24a. to the valve ball 14 so that when the pump 11 moves into engagement with the seat 24a, the ball 14 will be forced downwardly, pushing the spider 1l downwardly in the guide sleeve 85. Any sediment which has accumulated on the upper end of the spider lll and around the valve ball 1I, and also in or above the tapered seat 24a, will be displaced downwardly by the stem 1l. As the stem 18 is moving downwardly from the position in which it is shown in Fig. 5, and before the pump 11 engages the tapered seat 24C, the rush of oil downwardly and outwardly through the valve seat 24a and then through the passage 15 will wash the seat 24a and the vertical passage I1n of the valve body lla. The openings 8l between the arms 12 of the spider and the opening 82 through the collar 51 at the lower end of the guide sleeve 65 will permit sediment to pass downwardly through the sleeve 65 into the lower portion 83 of the sediment receptacle 5I.

When the pump 11 is seated in the tapered seat 26a, its subsequent operation will draw oil inwardly through the inlet opening 15 and then through the radial openings 19 of the hollow stem 18 into the pump. 'Ihis form of my invention is of especial utility with the Deep well pump and method of installing and removing the same, application filed March 5, i935, Serial No.

9,412, in which the fluid operated pump is adapted to pass downwardly through the inner tube of a pair of concentric tubes to operating position. It is found that when such a pump is moved down wardly into operating position, it scrapes sediment from the wall of the inner tube, this sediment collecting at the lower end of the outer tube. The valve structure shown in Fig. 5 makes it possible to dispose of this sediment so that the pump may properly seat ln the tapered valve seat 24a.

It will be understood that the construction shown in Fig. 5 may also be used to drain the production tubing lila when it is desired to remove the tubing from the well without the use of a special valve opening element such as the member 30 or the cylindrical body 50 shown in Figs. 2 and 4, respectively. When the pump I1 is seated in the tapered valve seat 24a, the ball is in lowered position on the spider 10, and the valve passage 15 is open to permit the pump 11 to draw fluid therethrough and force the fluid upwardly through the production tubing Illa. If it is desired to remove both the tubing Illa and the pump 11 from the well at the same time, the pump is raised a short distance away from the seat 24a so as to permit oil to flow downwardly from the production tubing Illa, through the vertical passage Ila, and outwardly through the passage 15, the ball 14 being held below the passage 15 by the stem 18 which is considerably longer than the distance from the tapered seat 24a, to the passage 15. Both the tubing IDa and the pump 11 may then be pulled from the well, the tubing being free to drain during such pulling so as to prevent a wet job. It will thus be apparent that the position of the pump 11 relative to the seat 24a, which may be adjusted from the surface of the ground, may be varied tb control the draining action of the valve passage 15 and cooperating ball 1d.

Although I have herein shown and described my invention in simple and practical form, it is recognized that certain parts or elements thereof are representative of other parts, elements, or mechanisms which may be used in substantially the same manner to accomplish substantially the same results; therefore, it is to be understood that the invention is not to be limited to the details disclosed herein but is to be accorded the full scope of the following claims` I claim as my invention:

l. In a well structure of the character described, the combination of: a tube extended down into said well. said tube having a seat near the lower end thereof; an inlet check valve at the lower end of said tube below said seat, said valve comprising a valve opening and a closure member for said opening; and a body adapted to be dropped into the upper end of said tube, whereupon it will gravitate to a position in proximity to said seat, said body having a part adapted to extend through said seat to engage said closure member and displace the same from said valve opening. l

2. In a well structure of the character described, the combination of: a tube extended down into said well, said tube having a seat near the lower end thereof; an inlet check valve at the lower end of said tube below said seat, said fil valve comprising a valve'opening and a closure member for said opening; and a member adapted to be dropped into the upper end of said tube, whereupon it will gravitate to the lower end thereof, said member having a part to extend through said seat to engage said closure member and dislodge the same from said valve opening, and said member having orifice means for producing a downward pressure differential sufficient to hold said closure member in open relation to said valve opening against the hydraulic pressures tending to close the same.

3. In a well structure of the character described, the combination of: a tube extended down into said well, said tube having a seat near the lower end thereof; an inlet check valve at the lower end of said tube below said seat, said valve comprising a valve opening and a closure member for said opening; and a member adapted to be dropped into the upper end of said tube, whereupon it will gravitate to the lower end thereof, said member having a part to extend through said seat to engage said closure member and dislodge the same from said valve opening, a tube-engaging sealing means thereon, and an orice bypassing said sealing means for producing a downward pressure differential suilicient to hold said closure member in open relation to said valve opening against the hydraulic pre..- sures tending to close the same.

4. In a well structure of the character described, the combination oi: a tube adapted io extend down into a well; an inlet check valve in the lower end of said tube, said valve comprising a valve opening and a closure member for said opening; and a releasing member adapted to move downwardly through said tube and engage said closure member to dislodge the same from said opening, said releasing member being so formed as to restrict the downward flow oi fluid through said tube to an extent producing a downwardly acting pressure differential above and below said releasing member sufficient to assure the holding of said closure member open against the hydraulic pressure tending to close the same.

5. In a well sructure of the character described, the combination of: a tube adapted to extend down into a well, said tube having an inlet check valve structure at the lower end thereof; and means for operating said check valve structure io drain said tube, said means comprising a member adapted to be moved downwardly through said tube to operative engagement with said check valve structure and being so formed as to res rict the downward flow of fluid through said tube whereby to produce a pressure differential above and below said member.

6. In a well structure of the character described, the combination of: a tube adapted to extend down into a well, said tube having an inlet check valve structure at the lower end thereof; and means for operating said check valve structure io drain said tube, said means comprising a member having a tube-engaging seal and an orice by-passing said seal, whereby to produce a pressure diilerential above and below said member.

7. In a well structure of the character described, the combination of: a production tube adapted to be extended into a well; an inlet check valve near the lower end of said production tube; and means operable within said production tube to open said valve, said means comprising a body adapted to slide within said production tube, said body having sealing means thereon for engaging the wall of said production tube, a by-pass connecting above and below said sealing means, and a valve-actuating part projecting downwardly from said body.

8. In a well structure of the character described, the combination of: a tube adapted to be extended into a well; a valve body connected to the lower end of said tube, said valve body having a chamber, a vertical opening connecting said chamber with the interior of said tube, and a lateral opening connecting said chamber with the exterior of said valve body, there being an inwardly faced valve seat in said lateral opening; a valve ball in said chamber adapted to be moved laterally by fluid pressure into engagement with said valve seat; and means operable within said tube to open said valve ball, said means comprising a body adapted to slide within said tube, said body having sealing means thereon for engaging the wall of said tube, a by-pass connecting above and below said sealing means, and a valve actuating part projecting downwardly from said body.

9. In a well structure of the character described, the combination of: a tube adapted to be extended into a well; a valve body connected to the lower end of said tube, said valve body having a chamber, a vertical opening connecting said chamber with the interior of said tube, and a lateral opening connecting said chamber with the exterior of said valve body, there being an inwardly faced valve seat in said lateral opening; a valve ball in said chamber adapted to be moved laterally by fluid pressure into engagement with said valve seat; and means operable within said tube io open said valve ball, said means comprising a body adapted to slide within said tube and having the lower end thereof formed so as to engage said valve ball and dislodge the same from said valve seat.

10. A valve for the lower end of the production tube of a well pumping device, comprising: a body connected to the lower end of said tube, said body having a chamber therein connected to the interior of said tube and a lateral inlet opening connecting said chamber with the exterior oi said body, there being a valve seat in said opening faced inwardly toward said chamber; and a closure member in said chamber adap ed to move laterally into engagement with said valve seat.

11. A valve for the lower end of the production tube of a well pumping device, comprising: a body connected to the lower end of said tube, said body having a chamber therein connected to the inerior of said tube and a lateral inlet opening connecting said chamber with the exterior of said body, there being an inwardly faced valve seat in said opening; a closure member in said chamber adapted to move laterally into engagement with said valve seat; and a valve opening means operative from the inside of said chamber to move said closure member from engagement wih said valve seat.

12. A valve for the lower end of the production tube of a well pumping device, comprising: a body connected to the lower end of said tube, said body having a chamber therein connected to the interior of said tube and a lateral opening Connecing said chamber with the exterior of said body, adapted to permit the entrance of iiuid into said chamber there being an inwardly faced valve seat in said opening; a closure member in said chamber adapted to move laterally into enopening;

gagement with said valve seat; and a receptacle connected to the lower part oi said .chamber for receiving sediment from said tube.

i3. A valve for the lower end of the production tube of a well pumping device, comprising: a body connected to the lower end of said tube, said body having a chamber therein connected to the interior of said tube and a lateral opening connecting said chamber with the exterior of said body, the're being an inwardly faced valve seat in said opening, the lower part of said chamber extending below said valve seat so as to form a sediment receptacle; a closure member in said chamber adapted to move laterally into engagement with said valve seat; and downwardly yieldable means supporting said closure member in operative alignment with said valve seat.

14. In a device of the character described, the combination of: a. tubular element; a valve means in said tubular element, said valve means comprising a valve opening and a closure member adapted to close said opening; opening means adapted to be longitudinally inserted into said tubular element so as to contact said closure member and unseat it from said opening to permit fluid in said tubular element to escape therefrom through said valve opening: and hydraulic means whereby said opening means is retained in position to maintain said valve means in open position.

15. In a device of the character described, the combination of: a tubular element adapted to contain a pumping means; an inlet check valve in said tubular element adapted to supplyr fluid to said pumping means, said valve comprising a valve opening and a closure member adapted to close said opening: opening means for moving said closure member from said valve opening so as to open said valve opening; and hydraulic means whereby said opening means is retained in position to maintain said closure member in open position with respect to said valve opening.

16. In a device of the character described, the combination of: a tubular element, said tubular element having a seat near one end thereof; a valve means in said tubular element, said valve means being positioned between said seat and said end, said valve means comprising a valve opening and a closure member adapted to close said opening; opening means adapted to be longitudinally inserted into said tubular element from the other end thereof from said valve means, said opening means having a part adapted to extend through said seat to engage said closure member and displace the same from said valve and hydraulic means whereby said opening means is retained in position to maintain said valve means in open position.

17. In a well structure of the character described. the combination of a tubular member in a well; valve means at the lower end of said tubular member, including walls forming a valve opening and a closure member adapted to close said opening: means for opening said valve means; and means for reducing the iluld pressure tending to close said valve means when said valve means is open.

18. In a well structure oi the character described, the combination of t a tubular member in a well; valve means at the lower end ot said tubular member, including walls forming a valve opening and a closure member adapted to close said opening; opening means adapted to be inserted longitudinally into said tubular member as to open said valve means; sealing means between said tubular member and said opening means; and walls forming an opening by-passing said sealing means.

19. In a well structure of the character described, the combination ci: a tubular member in a well; valve means having a chamber therein, said valve means being adjacent the lower end of said tubular member, including walls forming a valve opening and a closure member in said chamber adapted to close the inner end of said opening; a seat adjacent the lower end of said tubular member; pumping means adapted to be lowered through said tubular member into seating relation with said seat; means for opening said valve means so as to clean said seat as said pump is lowered through said tubular member and before said pump seats on said seat.

20. In a well structure of the character described, the combination of: a tubular member in a well; inletcheck valve means having a chamber therein, said valve means being adjacent the lower end of said tubular member in said chamber, including walls forming a valve opening and a closure member adapted to close the inner end of said opening; a seat adjacent the lower end ci said tubular member; pumping means adapted to be lowered to the lower end of said tubular member into seating relation with said seat; means for opening said valve means; and means for closing said valve means as said pumping means is raised through said tubular member.

21. In a well structure of the character described, the combination of a tubular member in a well; inlet check valve means having a chamber therein, said valve means being adjacent the lower end of said tubular member, including walls forming a valve opening and a closure member in said chamber adapted tc close the inner end of said opening; a seat adjacent the lower end of said tubular member; pumping means adapted to be lowered to the lower end of said tubular member into seating relation with said seat; means for opening said valve means as said pumping means is lowered through said tubular member; and means for automatically closing said valve means as said pumping means is raised through said tubular member.

22. In a deep well structure of the character described, the combination of: well tubing extending from the surface of the ground down into a well; inlet check valve means having a chamber therein, said valve means being adjacent the lower end of said tubing and associated therewith and providing an-inlet therefor, including walls forming a valve opening and a closure member in said chamber adapted to close the inner end of said opening; a pump seat at the lower end ci', said tubing; and pumping means adapted to seat on said seat in said tubing movable from the surface of the ground for opening said inlet check valve means.

23. In a deep well pumping device, the combination of: a tubular member in a well; check valve means adjacent the lower end ci said tubular member and associated therewith and providing an inlet therefor, including walls forming a chamber communicating with said tubular member. walls forming a valve opening communicating between said chamber and the exterior of said valve means, and a closure member in said chamber adapted to close the inner chamber end of said opening; a pump seat adjacent the lower end of said tubular member; pumping means adapted to be lowered through said tubular member into seating relation with said seat; and means operable by the movement of said pump for removing said closure member from said opening to open said check valve means before said pump seats on said seat.

24. In a deep well pumping device, the combination of: a tubular member in a well; check valve means adjacent the lower end. of said tubular member and associated therewith and providing an inlet therefor, including walls forming a chamber communicating with said tubular member; wallsforming a valve opening communicating between said chamber and the exterior of said valve means, and a closure member in said chamber adapted to close the inner chamber end of said opening; a pump seat adjacent the lower end of said tubular member; pumping means adapted to be lowered through said tubular member into seating relation with said seat; means for maintaining said check valve means open while said pump is in seating relation with said seat to permit wel1 uid to enter said pumping means, said means also maintaining said check valve open as said pumping means is raised less than a predetermined distance above said seat to permit well iiuid in said tubular member to drain through said opening into said well; and means for closing said check valve means when said pumping means is raised farther above said seat.

CLARENCE J. COBERLY.

CERTIFICATE OF CORRECTION.

Patent No. 2,155,272.

October 18, 1938.

CLARENCE J. COBERLY.

It is hereby certified that errorappears inthe printed specification of the above numbered patent requiring correction as follows: Page 5, second column, lines 22 and 25, claim 20, strike out the words "in said chamber" and insert the same after "member", line 2li, same claim; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day of December, A. D. 1958'.

(Seal) Henry Van Arsdal e Acting Commissioner of Patents.

said tubular member into seating relation with said seat; and means operable by the movement of said pump for removing said closure member from said opening to open said check valve means before said pump seats on said seat.

24. In a deep well pumping device, the combination of: a tubular member in a well; check valve means adjacent the lower end. of said tubular member and associated therewith and providing an inlet therefor, including walls forming a chamber communicating with said tubular member; wallsforming a valve opening communicating between said chamber and the exterior of said valve means, and a closure member in said chamber adapted to close the inner chamber end of said opening; a pump seat adjacent the lower end of said tubular member; pumping means adapted to be lowered through said tubular member into seating relation with said seat; means for maintaining said check valve means open while said pump is in seating relation with said seat to permit wel1 uid to enter said pumping means, said means also maintaining said check valve open as said pumping means is raised less than a predetermined distance above said seat to permit well iiuid in said tubular member to drain through said opening into said well; and means for closing said check valve means when said pumping means is raised farther above said seat.

CLARENCE J. COBERLY.

CERTIFICATE OF CORRECTION.

Patent No. 2,155,272.

October 18, 1938.

CLARENCE J. COBERLY.

It is hereby certified that errorappears inthe printed specification of the above numbered patent requiring correction as follows: Page 5, second column, lines 22 and 25, claim 20, strike out the words "in said chamber" and insert the same after "member", line 2li, same claim; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day of December, A. D. 1958'.

(Seal) Henry Van Arsdal e Acting Commissioner of Patents. 

